Abstract
The authors conducted a set of survey on suspended sediment transportation in the Kataniwa River, during the flood on September 22nd '96, and June 19th '97, and found out that the peak of wash load concentration appeared earlier than the peak of discharge, and fluctuation of wash load concentration followed the fluctuation of the rainfall intensity. To investigate these phenomena, a numerical simulation model, which describes the run-off of water and sediment transportation on the Kataniwa river basin, was developed. The model was given two processes of sediment transportation; wash load yields by the impact of raindrops and surface flow on the surface of basin, and suspended load yields in the channel. The result of simulation showed fairly good agreement with the observed data.
